campbell



G. W. CAMPBELL. TYPEWRITING MACHINE,

APPLICATION FILED JUNE 1, 191a.

/m/e/7 for:-

Patented Mar. 9,1920.

4 SHEETSSHEETI W/kflesses;

V e. w. CAMPBELL.

TYPEWRITING MACHINE.

APPLICATION FILED JUNE 71 184-8.

1,332,972, Patented Mar. 9, 1920.

4 SHEETS-SHEET 2.

will/r1111,

l W/fnessesi fivvenfon k W' jffidzm- I v Mm G. w. CAMPBELL.

'TYPEWRITING MACHINE. APPLICATIOIN FILED JUNEI. 1918.

1,332,972. Patented Mar. 9,1920.

4 SHEETSSHEET 3.

W/fnesses:

G. W. CAMPBELL.

TYPEWRITING MACHINE.

APPLICATION FILED JUNE 1. 19 18.

Patented Mar. 99,1920.

4 $HEETSSHEET 4.

W/f/vesseaance The relation with another that said i GEORGEW. CAMPBELL,Q15 HARTJEGE-D, CONE IECTI GUL J, AS$IGNOR Ti) UNDEBYVOL'D TYPEWVRITER@GMPANY, OF NEW] $63K, N. 1i; CORPQRATION OF DELA'WTYPEWRITKING-MACHINE.

Specification cf Letters Patent.

"Patented s, iese.

Application filed June "7, 1918. Serial No. 238,336.

-chines of the pffifiidbifi cias in which lighti 'en pactness iow costand speed oiproductiou. are seught; and reiates particularly to the contruction and manner of mount ing the is chzmisni which controls theletter- :i ocding IHO'iQhiLiii'SiG'i', the p ten.

liven when much-care is u c c in producin he; the parts, stdi usuallyfcund y to provide 1r final minute adjust in. order t bring theescape-silent L into exactoiiperatire posit 1e oi m intention is theavoidpleut cost oi 1g: and adjustiusi', and secure rehab? ty ofcoeperation heixweu t2, 0 parts oi the escapcn'ient mechai aisocustomary ph'iicilt practice to mcamt the parts of the escapcment mechaiwithiiiti e frame-work, theresy causing cult in reachin said iris, andoften ens when adjusting one member of ti member.- wiii be thrown out oiexact co i still anathcr a i so on. 'i

i requii the hsniounting'ei ted with the e; apeaient mechsaid mechanism.This nractice requires re one the machine.

" '""i1 j cut my ir ntion, I provide 2 ing member i or aii .ini re ti eparts ei'" i\ e ichitie when enc' pieced therccn. if operation mountingthe pa its on. said zz'ieinber to u unit may be done Withcut theframeu'oii; oi the machine sn'dthe unit States, residing in V ThisiZT-CSHCiOl'i relates to t1. p writing mai in order to reach. thedes'rcd parts-oi capement mechanism, integrally it the parts \Tlii be inexact cefrom the shop.

Another feature is that the portion of the backspacing; mechanism, whichcoiiperates directly with the escapemen' mechanism, is mounted. on theintegrally formed supporting member, thereby securing accuracy oicopcration between the hack-spacing mechanism and the escapementmechanism. when the parts are once placed on said member. s i

Another feature is that the spring drum ,which preps the carriage ismounted on abracket integral with semi supporting member. In this modeconstruction, the entire mechanism which causes the letter-feedine'vement-s of the carriage is assembled as a unit on said supportingmember. This pen wits a more advantageous suh-divisien 0i hiher in themanufacture of the machine, and iso ijaciiitates attaching the spring;drum to the machine smother .ture is that the necessity for greatacciniacy in producin 1' ball-bearings ier the escapement Wheel isavoided. Said whee] mounted on an arbor, one end of 'WJiCil supported inthe main portion of 1 )pcrting; member, and the other end of Wi i issupported in a bracket integrsl with said supporting member. The hub ofthe cscapcm-ent wheel has ba11-raccs formed thereon opposed hall-racesbeing mounted in said supporting member and bracket.

to avoid the their I l'eys it having connections escapenient riechanisinat each key stroke.

' aid of blanking and forming dies, and the b "a lkets which support theparts of the escapenient mechanism and thespring drum and itsadjusting,niechanisin, may by this 'inethod be integrally formed withsaid supporti nien'iher. ihis greatly reduces the cost: of manufacture,and insures intercha-n'geahilitiyof the parts, and reliability oi?cooperation. V.

3?. gain lightness, compactness and simplicity of structure, and lowcost of manufacture of the connections from the keyboard to theescapeinent mechanism. This is accomplished by forming many of the partsintegrally of light sheetanetal in such a manner as to afford rigidityand accessibility and permit the use of simple blanking and toriningdies.

Other features and advantages will hereinafterappear.

in the accompanying drawings,

i i'gure 1 is a general side View oi? a typewriting machine in section,showing my iniention applied thereto.

Fig. 2 isa sectional top plan view of the machine, parts""-"eing omittedfor clearness.

Fig. a. sectionaltront riew of the rea r portion of the niechineshowingthe escapeineit in .ChitillSTll, a portion of the hack-spacingmechanism[coope*ating therewith. and thcarriage;

F in, a 'sectio ial-top plan view throne the escapei'nent wheel andadjacent par showing the manner of mounting.

Fig. is a detail top plan view of cscapeinent mechanism detached fromshift-frame oi", theinechinem.

Fin. his cscapeinent iTi g. 7. is

apein ent V the wheel. adetail perspective new or pinion.

the

. Fig. 8 is-a detail perspectii e view 0. the parts'shown in Fig; 5.

Type keys l1. (Figsl and '2) are connected with bell-cran s 12, which,through .i1nlts.13,sw1ng upwardly ai rearwardl3 type-liars 14- havingtypes 15 at their for- 50 Ward ends, to strike against a work-sheetwoundaround :1

1(3 (Fats. .1 carriag l-i' l and 3), which is mounted on a nework 18 onwhich the carriage is shift-able vertically at the deiressionot shiftl'eys 19 (Fig. 1), o raise he platen 16 so that the writing line the coni-ll be brought opposite different case types 150. s'. ,id.type-hars[ach stroke oli e. type Key 11. the carter nace. the trtuate the t eriage 1 7 is caused to more a le 1 t The carriage s drawn in lett.r-feeding dithe 7 a detail perspective i'iew of the revoluhlecyliiierioal platen T and travels on a framework 18.

one it which fas on a dog rocker zl l, and the other oi: which. isournaled on ball-oearings at on said rocker. The loose dog 2 normally inengagement with a tooth 26 of an ceca euient wheel 27 mounted on anarhor said wheel having a driving connection with an cscapclnent i .ionnormally meshing with a rack 210 3) on the carriage 17.

"ession of a type key 11, thc is swung by mechanism, hcrcinafter dcscriled, to more the loose dog .23 out of the glans of the cscapenlcnt wheel:27 and to more the fast dog into the plane of the escapeincnt wheel.The escapcnient wheel and the carriage will then he held bf. 'lhe dog 22against actuation by the suf drum '21. and the loose dog 23 will he s 4by a spring 31 into cngz' ingrelation .s .th :1 succeeding tooth 32(Figs. :3 and 1? ethe cscapenient whccl. .lt the release of the t pekey. the iiast dog will be swung); out of the plane of said wheel andthe loosh dog 23 living}; returned will to arrest the wheel 27 and thecarriage when said succeeding tooth 32 moves the loose do;- 533 int:with a stop '33 (Figs. 3 and 5) provided on the lo z roclter ii.

The mechanism tor operating); the dogccrriage. inclus'les a universalbar 06 (Figs. 1 a 1d 2) undcrlring al the l c .'-le\'ers laT, which,when depressed. swing;- wild haido rnwardlr' against the tension oil asprinu 38 (Fig. 1), which continually tends to urge upwardly a hail ofwhich said liar forms apart. The hail 3.) is intcgrrall tornied 0tsheet-metal and has an arm ll) integrally formed therewith. to which isconnected an adjustable link 41. the :lorwaid end of which is connectedwith an arm l-Z fast on a rock shai't l3. on which a spacelzey i ismounted.

The hail 39 is mounted on a rock shaft journaled in brackets 17. At thedepressic-n 0t any character he said hail will he oi": the dog-rocker7.34. so that when the ha'l n iii swuiur at t depression of a key ll.5-, the arm 49 will he swung fouwardlv to. suing the dogij-rocl-zcr 2%about its pivots 5 and to move the loose dog 23 out ot engage with thetooth 26 01 the escapeincut wh l. Said pivots 53, it will he noted. are

provided in opposite ears bent over from the Sl1Q9'--ll16ttl plate ormember 67 the dog pivot being vertical, while the escapement wheel axisis horizontal. The fork 52 permits' the shift frame and the escapementunit to rise and fall while controlling the escapement of the carriage.A

The carriage 17 may be moved in an antiletter-feeding direction by aback-spacing mechanism provided with a key 56 to move said carriage oneletter-space backwardly. The loose dog 23 and its connections are suchas to permlt sa d backward rotation of the escapementwheel until ananteceding tooth .63 (Fig. 3) of said wheel is [moved mto engagingrelation with the dog 2; At the release of the back-spacing keyofiQthe'tooth 63 will be forced by the spring drum 21 against said loosedog until the latter is arrested by its'stop on the dog rocker; thuspositioning; the" carriage one letter-space back. a P

For ease and economy of manufaoture and for lightness and simplicityofconstruction, the parts of the eseapement mocha nism are mounted upon anintegrallyformed supporting member 67 (F 2, 3, and 8) in such a mannerthat said parts will be in exact coiiperative position when once mountedon said member, whichis prefen bly formed of an originally flat sheet ofmetal. I

This member 67 also c'arries'the spring; drum. 21 on a bracket 68integral with said member, and supportsthat portion of the back-spacing;inechanisin which coacts directly with the escapement wheel 27 on abracket 69 (Figs. 3 and also integral with said member. v

The tension of the spring drum 21, which j drives the carriage 17 may beadjusted by (Figs. 2, 5 and 8), which. is used to fasten the left end ofsaid member 67 to the shift frame 18, the pawl 72 being so formed as tobe held against displacement by the shift frame 18. g

The construction is such that the parts supported by the member 67' may"be assembled thereon, without the machine being in exact cooperativeposition, and subsequently attached to the shift frame 18, by means ofset screws 74 (Figs. 2 and 5), in such a manner that the escapementpinion 29 will be in position to mesh exactly with the rack-bar 30 ofthe carriage when said member and the parts supported thereby are onceplaced on the shift frame 18.

To rigidly hold the escapement wheel 27 and pinion 29 in theirrespective planes of rotation, the ball-bearings 75 on which they run (F4-) are made adjustable so that all lost-motion therebetwecn may betaken up.

For this purpose, the arbor 28 upon which theescapeniont wheel andpinion are mounted is in the form of a threaded bolt and nut, one end ofwhich is supported in the main portion of said member 67, and the otherend of which is supported in a bent-over portion 7 The esca o of Saidnicn'iber or plate 67. ment wheel is provided with a hub 77 at and 6),the ends of which are in the foim of ball-races 7 3, opposed ball-races79, 80 bemg mounted in said supporting member (37 and bentcver portionor bracket 76, respectively. The bracket 76, which supports said arbor28, is made flexible so as to be drawn toward the main portion of saidsupporting member, when said bolt and nut 28 are tightened to take upall the lost-motion in said bearings 7 5. This may be done without themachine, or may he done after said supporting member 67 is attached tothe shift frame 18; an opening 81 (Fig.8) being provided in said framethrough which the slotted hen d 82 of the bolt projects, so as to beaccessible for manipulation.

' It will be seen that withthis simple form of adjustment, lightness ofconstruction is attained, and lostanotion, due to wear, may.

also be corrected.

lit will also be seen that the inaccuracies of manufacture in producingthe hub 7 7 of the escapem'ent wheel 27, the ball-races 78, 79, SO andthe bracket 7 6 for supporting' the arbor 28, are overcome by making;said bracket flexible and the justable.

Toeflect a driving); connection between the escapement wheel 27 and theescapement pinion 29, the hub 77 of said wheel has a flat surface 85formed thereon (Figs. 2, 4. and 6), the plane of which is substantiallyparallel with the axis of the wheel 27 and is placed at a distance fromsaid axis to correspond with a similar flat surface 86 (Fig. 7) formedon the pinion 29, sothat when said pinion is slipped. onto the hub ofsaid wheel, the pinion and wheel will rotate in unison. Said surfaces85, 86 are so placed relatively to the graduations or teeth of the wheeland pinion and to the rack 30 on the carriage, that when the escapementwheel is ball-bearings adarrested by theloose dog 23, an index on aplaten-scale 87 (Figs. 1 and 2), provided at the :l:'ront of the platen16, will be at the writing point. 7

It will be noted that a single springBl for theloose escapement dog 23serves to throw said dog into engaging relation with the sum ccedingtooth ot' the escapement wheel 27 and to effect the throw of said dog ina letterieeding operation, said spring 31 also permitting said dog 23 tobe moved into ongaging relation with the anteceding teeth 6?) of theescapemcnt ,wheel.

It will be seen that with the herein-described form' of construction,the entire -e capement mechanism may be removed from the machine forrepairs or other adjustments, b loosening the set screws 73, 74:, andmaybe transported to a shop; for the purpose, without transporting theentire machine. This is a saving of expense in the cost of repairs, anddecreases the amount of packing required and liability of. breakage intransportation.

It will be noted among the features of improvement herein disclosed,that a unit comprising a ca-rriage-controlling mechanisml'orlattaclnnent to a typewritin machine mone endja dog device to'coiiperate with the teeth of said escapement wheel, and at the otherend a baror part by which it is operated; that said unit is mounted forcaseshifting movement up and down, said opcrating part 52 extending inan up and-down direction, and said rocker Qlbemgpwoted on a verticalaxis and said'escapement wheel 7 :27 being" pivoted on a horizontalaxis; that ball bearings are provided'upon said main plate for the endsor the shaft 28, means being provided for forcing the'bent-over part orthe mam plate toward the body thereof for taking up the play in the ballbearings;

that the spring barrel is provided with a spring having an ad ustingwheel that a pawl or dog 72 is provided to lock said adjusting wheel;that said pawl is pivoted upon: a. screw 73; that a support 18 for saidunit hasan' ear or part, Fig. 8, en'gageable by said+pawl to holdthe-same'in position; that the-shifting frame comprises Ta sheetmetalplate 18 on edge and formed with a earriage :trackatits upper edge,-saidunit being secured to said plate below said track,

and having a cut-away part, F ii, to al rord access to said unit; thatthe unit plate has an outward bend, Fig. 2, to pass through the openingin said case-shifting frame 18 to carr said spring-adjusting wheel onthe outer or 1'' side of said frame 18; and that said screw assesthrough said case-shiftingframe and secures said unit-plate to the innerend of said caseshitting Frame.

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others.

Having thus described my invention, I claim 1. In a typewriting machine,the combination of a traveling carriage, an escapement mechanism torcausing letter iced movements of said carriage, an escapement wheelforming part of said escapement mechanism, an escape-merit pinionforming part of said escapement mechanism, a. flat surface "formed onthe hub of said wheel, and a ilill?SllFfHCG'fOlTlTlGCl on said pinion,said surfaces being so placed that the teeth of said wheel and saidpinion will be in cor rect coiiperative position when said wheel andpinion are once assembled.

2. In typewritin g machine, the combination with a platen, of a.traveling carriage, a. shift-frame therefor, an escapeinent mechanismincluding a. pinion for causing letter-feed movements of said carriage,a rack bar on said carriage normally meshing with said pinion, and anintegrally-formed support on which the parts f said escapemeut mechanismare mounted in correct coopera-tive position when once placed on saidsupport, said support being so formed that said pinion and rack will bein correct meshing position when said support is once placed on saidframe.

3. In a. typewriting machine, the combination of traveling carriage,means for causing letter-feed movements of said carriage, an escapementwheel forming part of said means, ball-bearings and an arbor on whichsaid wheel is mounted, an integrally-formed supporting member for saidmeans, and a flexible bracket integral with said member for supportingone end of said arbor, said bracket being adjustable axially of saidarbor for adjusting said bearings.

l. In a typewriting machine, the combination of a. traveling carriage,means for causing letter-feed movements of said carriage, an escapementwheel and pinion forming part of said means, an integrally-formedsupporting member for said means. and a bracket integral with saidmember for supporting said wheel and pinion, said bracket being flexibleto take up axial lost-motion of said wheel and pinion.

- 5. In a typewriting machine, the combination of a traveling carriage,means for caus- Inc on said arbor accessibly placed on the machine foradjusting said bracket.

6. A unit of carriagecontrolling meshenism for-attachment to atypewriter ma chine, comprising a sheet-metal plate having; at one end acarriage-driving spring, and having at the other. end-an eseapementwheel and pinion, said-other end beingbent over to confine the wheel andpinion, the wheel and pinion mounted upon a shaft, means being providedfor forcing the bent-over part of the plate toward the body thereof fortakingup the play in the shaft, and a rocker mounted on said platebetween said escapement wheel and said sprin and having dog devices tocoiiperate with. said escapement wheel. 1

7. A. unit of carriage-controllingmechanism for attachment t atypewriting machine, comprising a sheet-metal plate having at one end acarriage-driving spring. and having at the other end an escapement wheeland pinion, said other end being bent over to confine the wheel andpinion. the wheel and pinion mounted upon a shaft, means being providedfor, forcing the bentover part of the plate toward the body thereof fortaking up the play in the shatt,-and a rocker mounted on said platebetween said escapement wheel andsaid spring. and having dog devices tocotinerate with said escapement wheel, said plate having; opposite ibentears between which said rocker is confined, and in which it is pivotallysupported.

8. A unit of carriagecontrollingmechanism for attachment to atypewriting' machine, comprising a sheet-metal plate having at one end.a carriage-driving sprin and having at the other end an escapement wheeland pinion, said other end being; bent over to confine the wheel andpinion. the wheel and pinion mounted upon a shaft. means being providedfor forcing the bentover part of the plate toward the body thereof fortaking up the play in the'shaft. a rocker mounted on said plate betweensaid escapement wheel and said spring. and having dog devices tocooperate with said escapement wheel, and an arm pivoted; upon saidplate in position to carry a back-spacing dog into engagement with saidescape ment wheel.

9. A unit of carriage-controlling mechanism for attachment to atypewriting machine, comprising a sheet-metal plate having at one end acarriage-drixing spring, and having at the other end an escapement wheeland punch, sa d other end helng bent over to confine the wheel andpinion, the

wheel and pinion mounted upon a shait,

'means being provided for forcing the bent ever part of the plate towardthe body thereof fol-taking up the play in the shaft, 11 rockermountedon said platebetween said escapement wheel and said spring, and havingdog devices to cotiperate' with said capement wheel, an arm pivoted uponsaid plate, and a back-spacing dog mounted upon said arm infposition tohe guided thereby into engagement with said escape ment wheel. 7

10. A unit of .carriage-controlling mechaanism for attachment to atypewriting' machine, comprising a sheet-metal plate having at one end acairiagedriving spring, and having at the other end an escapement wheeland pinion, said other end being bent over to confinethe wheel andpinion,

. the wheel and pinion mounted upon a shaft,

means being provided for forcing the bentover part of the plate towardthe body thereof for taking up the play in the shaft, and a rockermounted on said plate between said escapement wheel and said spring,said plate having opposite bent ears between which said rocker isconfinedand in which it is pivotally supported, said rocker ha ing' atone end dog); device to cotlperate with the teeth of said escapementwheel, and having at the other end a part by which it is operated.

11. A. unit of carriage-controlling mechanism for attachment to atypewriting machine,'comprising a sheetmetal plate hav ing at one end-acarriagedriving spring. and having at the other end an escapeinent wheeland pinion. said other end beingbeut over to confine the wheel andpinion, the wheel and pinion mounted upon a shaft. means being; providedfor forcing the bentover part of the plate toward-the-body thereof fortaking" up the-plavin the shaft, and a rocker mounted on said platebetween said. escapement wheel. and said spring, said rocker having); atone end a dog device to coiiperate with the teeth oi? said escapementwheel. and having at the other end a part by which it is operated; theunit being mounted for case-shifting movement up and down, saidoperating part extending; in upand-down direction.- said rocker beingpivoted on a vertical axis, and said escapement wheel bein pivoted on ahorizontal axis.

12. A unit oi carriage-controlling mechanism for attachment to atypewritinp; machine, comprising a sheet-metal plate having anescapement wheel and pinion. the wheel and pinion mounted upon a shaft,and said plate being bent over to confine said wheel, ball-bearing.devices being proing an escapenient wheel and pinion, the

whe'eland pinion inounted upon a shaft,

and said plate being bent over to'eonfine said Wheel, balLb'earingdevices being provided 111 said plate for the ends of the shaft, meansbeing provlded for springing or forcingsaid bent over partof the platefor taking-up the play in the ball-bearings, and an esoapenient dogrocker mounted on said plate, and having dog devices to cooperate withsaid escap'enient wheel, said plate havingioppo'site ears between whiohsaid rocker is confined and in which itispivotally supported. p

14c. A sheet-metal plate having at one end a bearing for acarriage-driving spring, and having at the other end'bearings for anescapenient wheel and pinion, said other end being bent over to inclosethe wheel and pinion, means being. provided for forcing the bent-overpart of the plate for taking up the play in the, wheel boa-thigs, and adogrooker, said plate also having opposite bent ears between which saidrocker is confined and in which it is piv otally supported.

15; A sheet-metal plate havingat one end a bearingitor acarriage-oriving-spring, and having at the other end bearings for aneseap'eme'nt wheel and pinion said other end being bent over to inclosethe wheel and pinion, means being; provided for foreing the' bentfoverpart oi? the plate for taking: up the p'layi-ntlie wheel bearings, and adog: rocker, said o'late also havingopposite bent ealsfbetwe'en whichsaidrocker is confined and in ,whie hI it" is pivotally. supported sa id plate" also h ving a bearing for an arm to earrv a backspacing doginto engagement with said escapen'ientwheeh Y 1 6, unit ofearriage-controlling ineehanisrn for attachment to a typewritingmachine, eoniprising a metal plate having at one end, a carriagedrivingsoring barrel, and shaving atthfe other end an eseapeznent wheel and.pinion, a rocker mounted on said plate between said, escapen ent wheeland said spring: barrel andhaving dog devices to cooperate withsaidesoapeme'nt wheel, said barrelployided with a spring having anadjusting wheel, a pawl or dog to lock said adjusting Wheel, a screwupon which said pawl is pivoted, and support for said unit, the supporthaving a. part engageable by said pawl to hold the same in position.

the hall-bearings, and

17. A. unit of JZLlIllZlQCrCUIlill'Olllllg mechanism for attachment to aty nzwriting nrw chine, compris n a sheet-meta l plate having at one enda carriage-driving spring. and having at the othrr end an cscapciucntwheel and pinion, a rocker mounted on said plate between i idcscapeinont wheel and said spring. and having dog devices to cooperatewith said eseapernent wheel, and a frame shiitable up and down todilforcnt ease positions, aid it'rauie comprising a sheetnietal plateonedge and'ij'ornied with a carliege-guiding rib at its upper edge, saidunit being secured to said plate below said rib, and havine a cut-awayportion to a (ford SUSS to said unit.

18. i unit o'l carriage-controlling mechanism for attachment to atypewriting inaohine, (Jenn -rising a metal plate havingat one end acarriagddriving spring barrel, and h; at the other end an eseapeinentwheel and pinion, a rocker i'nounted on said plate letween saidescapeinent wheel and said spring barrel and having dog devices toeeiiperate with said escapoment v hecl. said barrel provided with aspring having an adjus' re; wheel, a pawl or dog to lock said adju 11;);wheel, a screw upon which said pawl pivoted. and a support for saidunit, lhe support havinga part engageable by said pawl to hold the somein position, said support in the form o! a Frame shiftalole up and downtodiflerent case ])O sitions, said frame comprising; a. sheet-nwtalplate on edge and formed with a carriageguidingr rib at its upper edge,said unit being secured to said plate below said rib, and having acut-away portion to aflord access to said unit. saio unit plate havingan outward bend to pass through an opening in said frame, to carry saidspring-adjusting wheel on the outer side of saidease-shifting frame, andsaid screw passing through. said case-shiftingframe and pawl, andseruring snidunitplate to the inner side oi? said (aseshi'fting frame.

19. A sheet-metal struck-up case-shifting frame having acarriage-guiding rib, and having detachahlr secured upon its front facesheet-metal plate carrying a spring barrel. an escapement wheel andpinion shaft, and also carrying: a dog rocker for cooperation with saidcseapeinent' wheel: said plate bent at one end to form supports: fortheends of the escapement wheel shaft, and having ears bent over to afiordbearings for the do; rocker, and said ease-shifting frame havingportions out away for access to said plate and parts carried thereby.

20. A sheet-metal struck-up case-shifting frame having dotachablysecured upon its front face a unit comprising a sheet-metal plateearryin an. escapeinent wheel and pinio 1 13;, d a dog rocker forcooperation with said escapement Wheel; said plate bent to form supportsfonthe escepeinent Wheel shaft, and having eels bent over to affordbeerings for the dog rocker.

21. i: czlse-sl'ii'fting fieine having detachzibly secured upon itsfront face a sheetiuetu] plate carrying a spring-barrel, en eseepenxentWheel and pinion shaft, and a deg rocker for coiiperetion withsaideseape- 10 Inent Wheel; said plate bent at one end to ferxn supportsfor the ends of the escapement Wheel shaft, and having ears bent over toafford bearings for the dog rocker, and said case-shifting frame havingportions cut awav for access to said plate and pert val-rind thereby.

GEORGE \V. CAMPBELL. Witnesses W. A. DOBsON, M. S. EAKIN.

